CN211321558U - Eye-protecting lamp control circuit for cold cathode light source - Google Patents
Eye-protecting lamp control circuit for cold cathode light source Download PDFInfo
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- CN211321558U CN211321558U CN202020209926.2U CN202020209926U CN211321558U CN 211321558 U CN211321558 U CN 211321558U CN 202020209926 U CN202020209926 U CN 202020209926U CN 211321558 U CN211321558 U CN 211321558U
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- 239000003990 capacitor Substances 0.000 claims description 50
- 238000004804 winding Methods 0.000 claims description 39
- 238000001914 filtration Methods 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 5
- 150000001450 anions Chemical class 0.000 abstract 3
- 230000002457 bidirectional effect Effects 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model discloses eye-protecting lamp technical field especially relates to an eye-protecting lamp control circuit for cold cathode light source, including the module of adjusting luminance, a rectifying circuit, filter circuit, oscillator circuit and cold anion fluorescent tube, the commercial power is in proper order through the switch, the module of adjusting luminance, a rectifying circuit, filter circuit and oscillator circuit link to each other with cold anion fluorescent tube, the module of adjusting luminance includes a plurality of electric capacity that connect in parallel each other, rectifier circuit adopts the bridge rectifier who comprises four diodes, filter circuit adopts parallelly connected electric capacity group, oscillator circuit includes first triode V1, second triode V2, first transformer B1, second transformer B2, fifth diode D5 and bidirectional trigger diode D6, be the power supply of cold anion fluorescent tube through oscillator circuit, and realize adjusting luminance by the different voltages of electric capacity module output, thereby reach the change of light strong and weak, circuit structure is simple and stable.
Description
Technical Field
The utility model belongs to the technical field of the eye-protecting lamp, especially, relate to an eye-protecting lamp control circuit for cold cathode light source.
Background
Most of eye protection table lamps in the market adopt LED light sources, and although the brightness of the LEDs can be adjusted through electrodeless frequency modulation, the intensity of blue light contained in the LEDs is high, the light is too pale, and fatigue damage to eyes of a human body is easily caused.
The CCFL cold cathode light source is an artificial light source which is closest to natural light at present and has the advantages of high display index, no flash screen, no glare, low heat dissipation, low energy consumption, no influence of voltage change on illumination, long service life and the like, wherein the cold cathode fluorescent lamp tube does not need to heat the cathode, and the trend energy change of an interface is controlled by the action of an electric field, so that electrons in the cathode convert potential energy into kinetic energy to be emitted outwards. The design of a cold cathode light source eye-protection lamp control circuit is a development requirement of cold cathode light source eye-protection lamps.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model provides an eyeshield lamp control circuit for cold cathode light source satisfies the drive of cold cathode fluorescent tube and the demand of adjusting luminance.
The utility model provides an eyeshield lamp control circuit for cold cathode light source, includes dimming module, rectifier circuit, filter circuit, oscillating circuit and cold cathode fluorescent tube, and the commercial power links to each other with cold cathode fluorescent tube through switch, dimming module, rectifier circuit, filter circuit and oscillating circuit in proper order.
Further, the oscillator circuit includes a first triode V1, a second triode V2, a first transformer B1, a second transformer B2, a fifth diode D5 and a diac D6, wherein one end of the diac D6 is grounded via a ninth capacitor C9, the other end is connected to the base of the second triode V2, and one end of the diac D6 connected to the ninth capacitor C9 is connected to the output terminal of the filter circuit via a first resistor R1, the emitter of the second triode V2 is directly grounded, the collector of the second triode V2 is connected to the emitter of the first triode V1 via a third resistor R3, the cathode of the fifth diode D5 is connected to the collector of the second triode V2, the anode of the fifth diode D5 is connected between the first resistor R1 and the ninth capacitor C9, and the collector of the second triode V2 is connected to the output terminal of the filter circuit via a tenth capacitor C10;
two groups of secondary windings L1a and L1B are led out from a primary winding L1c of the first transformer B1, one end of the secondary winding L1B is connected to the base electrode of a second triode V2 through a fifth resistor R5, and the other end of the secondary winding L1B is directly grounded; the collector of the first triode V1 is connected to the output end of the filter circuit, one end of the secondary winding L1a is connected to the base of the first triode V1 through the second resistor R2, the other end of the secondary winding L1a is connected to the collector of the second triode V2, one end of the primary winding L1C is connected to the collector of the second triode V2, the other end of the primary winding L1 is connected to one end of the secondary winding n1 of the second transformer B2, the other end of the secondary winding n1 of the second transformer B2 is connected to the output end of the filter circuit through the eleventh capacitor C11 and the second capacitor C12 which are connected in parallel, and one end of the primary winding of the second transformer B2 is connected to the other end of the filter circuit through the thirteenth capacitor C13 and the cold.
Further, the rectifying circuit adopts a bridge rectifier consisting of four diodes.
Furthermore, the filter circuit comprises a seventh capacitor C7 and an eighth capacitor C8, one end of the seventh capacitor C7 and one end of the eighth capacitor C8 are respectively grounded, and the other ends of the seventh capacitor C7 and the eighth capacitor C8 are respectively connected with the output end of the rectifier circuit.
Further, the dimming module comprises a plurality of capacitors connected in parallel with each other.
The utility model discloses a beneficial effect that is used for cold cathode light source's eye-protecting lamp control circuit: the commercial power links to each other with cold cathode fluorescent tube through switch, module, rectifier circuit, filter circuit and oscillating circuit in proper order, supplies power for cold cathode fluorescent tube through oscillating circuit to realize adjusting luminance by the different voltages of electric capacity module output, thereby reach the change of light power, circuit structure is simple and stable.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention;
FIG. 2 is a circuit diagram of the present invention;
in the figure: 1. switch, 2, module of adjusting luminance, 3, rectifier circuit, 4, filter circuit, 5, oscillator circuit.
Detailed Description
The present invention will be further described with reference to the following examples, which are only part of the present invention, and these examples are only used to explain the present invention, and do not constitute any limitation to the scope of the present invention.
The utility model discloses an eye-protecting lamp control circuit for cold cathode light source mainly includes module 2, rectifier circuit 3, filter circuit 4, oscillation circuit 5 and the cold negative fluorescent tube of adjusting luminance, and the commercial power links to each other with the cold negative fluorescent tube through switch 1, module 2, rectifier circuit 3, filter circuit 4 and oscillation circuit 5 in proper order.
Specifically, after the power switch is turned on, the 220V mains voltage is input to a bridge rectifier formed by diodes D1-D4, i.e., a rectifying circuit, through a dimming module and a fuse F, and is rectified by the rectifier, and then filtered by a filter circuit formed by a seventh capacitor C7 and an eighth capacitor C8 to generate a dc voltage. The voltage is firstly added to a collector of a first triode V1 to supply power for the first triode V1; the second path is added to a primary winding n1 of a second switching transformer B2 through an eleventh capacitor C11 and a twelfth capacitor C12; the third path charges a ninth capacitor C9 through a first resistor R1.
When the voltage across the ninth capacitor C9 reaches the breakover voltage of the diac D6, the diac D6 is turned on, turning on the second transistor V2. After the second triode V2 is turned on, the voltage at both ends of the eighth capacitor C8 forms a conducting loop through the eleventh capacitor C11, the twelfth capacitor C12, the primary winding n1 of the second switching transformer B2, the secondary winding L1C of the first switching transformer B1, the second triode V2 and the fourth resistor R4, so that not only the primary windings of the first switching transformer B1 and the second switching transformer B2 generate electromotive force, but also the eleventh capacitor C11 and the twelfth capacitor C12 establish left positive and right negative voltages. After the secondary winding L1c of the first switching transformer B1 generates the lower positive and upper negative electromotive forces, the secondary winding L1a thereof generates the lower positive and upper negative electromotive forces, and the secondary winding L1B generates the upper positive and lower negative electromotive forces. The electromotive force generated by the secondary winding L1a reversely biases the first transistor V1 to be turned off, and the electromotive force generated by the secondary winding L1b is applied to the base of the second transistor V2 through the fifth resistor R5, so that the second transistor V2 is rapidly turned on in a saturated state due to positive feedback. After the second transistor V2 is turned on in saturation, the current flowing through the primary windings of the first switching transformer B1 and the second switching transformer B2 does not increase any more, and the current of the inductor cannot change suddenly, so the primary windings of the first switching transformer B1 and the second switching transformer B2 generate reverse electromotive force through self-inductance.
The secondary winding of the first transistor V1 generates reverse electromotive force, so that the second transistor V2 is rapidly reverse-biased off by the upper negative and lower positive electromotive forces generated by the secondary winding L1b, and the first transistor V1 is saturated and turned on by the upper positive and lower negative electromotive forces generated by the secondary winding L1a through the second resistor R2. After the first triode V1 is turned on in a saturated state, the voltages at the two ends of the eleventh capacitor C11 and the twelfth capacitor C12 are discharged through a loop formed by the first triode V1, the third resistor R3, the primary winding of the first switching transformer B1 and the primary winding of the second switching transformer B2, so that the n1 winding of the second switching transformer B2 generates electromotive forces of positive upper and negative lower polarities. With the continuous discharging of the eleventh capacitor C11 and the twelfth capacitor C12, the currents flowing through the primary windings of the first switching transformer B1 and the second switching transformer B2 decrease, so that they generate reverse electromotive forces again, as described above, the first triode V1 is turned off, the second triode V2 is turned on, and the above processes are repeated, the oscillator operates in an oscillation state, and after the oscillation pulse is boosted by the second switching transformer B2, the oscillation pulse is output from the secondary winding thereof, and is coupled by the thirteenth capacitor C13 to supply power to the cold cathode fluorescent tube, so that the cold cathode fluorescent tube emits light.
When the switch at the bottom is switched on, the voltage of the mains supply is directly sent to the bridge rectifier circuit without being reduced by the capacitor, the voltage at two ends of the seventh capacitor C7 is the maximum, at the moment, the voltage output by the second switch transformer B2 is also the maximum, and the cold cathode lamp tube emits the brightest light; when other switches are switched on, the voltage of the mains supply is reduced through the capacitor, so that the voltage at two ends of the seventh capacitor C7 is reduced, the voltage output by the second switch transformer B2 is reduced, and the cold cathode lamp tube is dark and light. Because the capacitance of the capacitor is different, the voltage output by the capacitor module is different, and finally the dimming control is realized.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent embodiments with equivalent changes by utilizing the above disclosed technical contents without departing from the technical scope of the present invention, but all the technical matters of the present invention do not depart from the technical scope of the present invention.
Claims (5)
1. The utility model provides an eyeshield lamp control circuit for cold cathode light source which characterized in that: the commercial power is connected with the cold cathode lamp tube sequentially through the switch, the dimming module, the rectifying circuit, the filtering circuit and the oscillating circuit.
2. The eye-protection lamp control circuit for a cold-cathode light source of claim 1, wherein: the oscillator circuit comprises a first triode V1, a second triode V2, a first switching transformer B1, a second switching transformer B2, a fifth diode D5 and a diac D6, wherein one end of the diac D6 is grounded through a ninth capacitor C9, the other end is connected to the base of the second triode V2, one end of the diac D6 connected to the ninth capacitor C9 is connected to the output terminal of the filter circuit through a first resistor R1, the emitter of the second triode V2 is directly grounded, the collector of the second triode V2 is connected to the emitter of the first triode V1 through a third resistor R3, the cathode of the fifth diode D5 is connected to the collector of the second triode V2, the anode thereof is connected between the first resistor R1 and the ninth capacitor C9, and the collector of the second triode V2 is further connected to the output terminal of the filter circuit through a tenth capacitor C10;
two groups of secondary windings L1a and L1B are led out from a primary winding L1c of a first switching transformer B1, one end of the secondary winding L1B is connected to the base electrode of a second triode V2 through a fifth resistor R5, and the other end of the secondary winding L1B is directly grounded; the collector of the first triode V1 is connected to the output end of the filter circuit, one end of the secondary winding L1a is connected to the base of the first triode V1 through the second resistor R2, the other end is connected to the collector of the second triode V2, one end of the primary winding L1C is connected to the collector of the second triode V2, the other end is connected to one end of the primary winding n1 of the second switching transformer B2, the other end of the primary winding n1 of the second switching transformer B2 is connected to the output end of the filter circuit through the eleventh capacitor C11 and the second capacitor C12 which are connected in parallel, and one end of the secondary winding n2 of the second switching transformer B2 is connected to the other end thereof through the thirteenth capacitor C13 and the cold cathode lamp tube in sequence to form a loop.
3. The eye-protection lamp control circuit for a cold-cathode light source of claim 1, wherein: the rectifying circuit adopts a bridge rectifier consisting of four diodes.
4. The eye-protection lamp control circuit for a cold-cathode light source of claim 1, wherein: the filter circuit comprises a seventh capacitor C7 and an eighth capacitor C8, one end of the seventh capacitor C7 and one end of the eighth capacitor C8 are respectively grounded, and the other ends of the seventh capacitor C7 and the eighth capacitor C8 are respectively connected with the output end of the rectifying circuit.
5. The eye-protection lamp control circuit for a cold-cathode light source of claim 1, wherein: the dimming module comprises a plurality of capacitors which are connected in parallel with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020209926.2U CN211321558U (en) | 2020-02-26 | 2020-02-26 | Eye-protecting lamp control circuit for cold cathode light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020209926.2U CN211321558U (en) | 2020-02-26 | 2020-02-26 | Eye-protecting lamp control circuit for cold cathode light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211321558U true CN211321558U (en) | 2020-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020209926.2U Expired - Fee Related CN211321558U (en) | 2020-02-26 | 2020-02-26 | Eye-protecting lamp control circuit for cold cathode light source |
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| Country | Link |
|---|---|
| CN (1) | CN211321558U (en) |
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2020
- 2020-02-26 CN CN202020209926.2U patent/CN211321558U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200821 |